Applied Measurements Ltd was asked to design a batch weighing system where the ingredients of each batch would constantly vary. To weigh the batches into the barrels AML built a stainless steel weighing platform incorporating load cells to the specific size required by the customer. As the barrels could be dropped on to the weighing platform, positive overload stops were included to protect the load cells.
The output signal from the weighing platform is fed into a digital display, which has two set point relays. Connected to the digital there is also a touch screen display, this enables the operator to see the live reading, the batch reading, the total batches and a numeric keypad to input the individual batch size. The touch screen controls the set point relays in the digital display.
Also built into the control panel were two further digital indicators connected to PT100 temperature probes monitoring two mixing vessels. The complete batch weighing system was set up to let the batching control proceed, however if one of the mixing vessels temperatures went out of range the relays of the digital indicators would cut the pumps to the main mixing vessel. The operator at a glance can see his two temperature readings, his live weight on the platform and has full control of his batching.
The total flexibility of the touch screen technology means that AML could program the batch weighing system to suit the customer’s requirements, including showing the customer’s name and logo on screen. The use of the touch screen technology enables AML to offer a very cost effective flexible process control system for a diverse range of applications.